Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Changes in Level 3 Portfolio (Details)

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Fair Value Measurements - Changes in Level 3 Portfolio (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance $ 8,697,747 $ 5,796,765 $ 8,028,268 $ 4,895,099
Purchases of investments 1,249,691 435,762 2,575,185 1,298,121
Proceeds from principal repayments and sales of investments (286,583) (139,102) (967,695) (169,735)
Transfers into Level 3 0 0 0 9,463
Transfers out of Level 3 0 0 (6,974) (4,714)
Ending balance 9,705,173 6,130,906 9,705,173 6,130,906
Net change in unrealized appreciation (depreciation) related to financial instruments still held 35,922 27,090 55,431 83,934
Investments | Accretion of discount/amortization of premium        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Gain (loss) included in earnings 14,267 7,627 38,345 15,650
Investments | Net realized gain (loss)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Gain (loss) included in earnings (1,621) 1,804 (8,427) 558
Investments | Net change in unrealized appreciation (depreciation)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Gain (loss) included in earnings 31,672 28,050 46,471 86,464
First lien debt        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 8,557,580 5,774,333 7,956,235 4,882,393
Purchases of investments 1,228,686 431,483 2,486,339 1,292,886
Proceeds from principal repayments and sales of investments (286,583) (138,977) (967,310) (169,558)
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 (6,974) (4,714)
Ending balance 9,543,295 6,104,163 9,543,295 6,104,163
Net change in unrealized appreciation (depreciation) related to financial instruments still held 35,367 26,888 54,266 84,064
First lien debt | Accretion of discount/amortization of premium        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Gain (loss) included in earnings 14,116 7,621 38,133 15,602
First lien debt | Net realized gain (loss)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Gain (loss) included in earnings (1,621) 1,853 (8,487) 960
First lien debt | Net change in unrealized appreciation (depreciation)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Gain (loss) included in earnings 31,117 27,850 45,359 86,594
Second lien debt        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 19,764 18,048 19,441 8,794
Purchases of investments 0 1,879 0 1,879
Proceeds from principal repayments and sales of investments 0 0 0 0
Transfers into Level 3 0 0 0 9,463
Transfers out of Level 3 0 0 0 0
Ending balance 19,071 20,039 19,071 20,039
Net change in unrealized appreciation (depreciation) related to financial instruments still held (732) 86 (448) (156)
Second lien debt | Accretion of discount/amortization of premium        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Gain (loss) included in earnings 39 25 78 58
Second lien debt | Net realized gain (loss)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Gain (loss) included in earnings 0 0 0 0
Second lien debt | Net change in unrealized appreciation (depreciation)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Gain (loss) included in earnings (732) 87 (448) (155)
Other secured debt        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 63,719   0  
Purchases of investments 0   63,700  
Proceeds from principal repayments and sales of investments 0   0  
Transfers into Level 3 0   0  
Transfers out of Level 3 0   0  
Ending balance 64,304   64,304  
Net change in unrealized appreciation (depreciation) related to financial instruments still held 477   476  
Other secured debt | Accretion of discount/amortization of premium        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Gain (loss) included in earnings 108   128  
Other secured debt | Net realized gain (loss)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Gain (loss) included in earnings 0   0  
Other secured debt | Net change in unrealized appreciation (depreciation)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Gain (loss) included in earnings 477   476  
Unsecured debt        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 16,603 1,915 15,936 1,606
Purchases of investments 13,997 66 14,591 443
Proceeds from principal repayments and sales of investments 0 0 0 0
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Ending balance 30,568 1,975 30,568 1,975
Net change in unrealized appreciation (depreciation) related to financial instruments still held (36) 14 35 (65)
Unsecured debt | Accretion of discount/amortization of premium        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Gain (loss) included in earnings 4 (19) 6 (10)
Unsecured debt | Net realized gain (loss)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Gain (loss) included in earnings 0 0 0 0
Unsecured debt | Net change in unrealized appreciation (depreciation)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Gain (loss) included in earnings (36) 13 35 (64)
Equity investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 40,081 2,469 36,656 2,306
Purchases of investments 7,008 2,334 10,555 2,913
Proceeds from principal repayments and sales of investments 0 (125) (385) (177)
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Ending balance 47,935 4,729 47,935 4,729
Net change in unrealized appreciation (depreciation) related to financial instruments still held 846 102 1,103 91
Equity investments | Accretion of discount/amortization of premium        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Gain (loss) included in earnings 0 0 0 0
Equity investments | Net realized gain (loss)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Gain (loss) included in earnings 0 (49) 60 (402)
Equity investments | Net change in unrealized appreciation (depreciation)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Gain (loss) included in earnings $ 846 $ 100 $ 1,049 $ 89